Remote indicating pressure gauge



s it. 3, 1935.

C. A. DE GIERS REMOTE INDICATINGPRESSURE GAUGE ofi inai'l-"iled Oct. 1, 1950 2 Sheets-Sheet 1 INVENTOR /%M%,&M

v ATTORNEY Sept. 3, 1935. I c. 'A. DE GIERS 2,013,138

REMOTE INDIGATING PRESSURE GAUGE Original Filed Oct. 1, 1950 2 Sheets-Sheet 2 INVENTOR BY 3 I I ATTORfi use; Sept. a, 1935 2,013,138 more. mpica rnvc PRESSURE GAUGE Clarence A. deGiers, Forest Hills, N..Y.,'assignor,'

by mesne. assignments, to Richard (kltlurphy,

' New York, N. Y. 7

Original a plication October 1, 1930; Serial No. i 485,838. Divided and this application April 2'L This invention pertains to remote control devices of the hydraulic type, particularly a modification adapted for use as a pressure gauge. This application is a division of my applica- 5 tlon Serial No. 485,808, filed October 1,71930,'for remote control apparatus and which matured in a patent No. 1,881,266, Oct. 4, 1932. Fig. 1 is a view in cross-section of a remote indicating pressure gauge.

Fig, 2 is a view in cross-section of a remote indicating pressure gauge differing in detail from theapparatus shown in Fig. 1 For the purpose of illustration a pressure t 340'is shown having a flange 343 for convenience in attaching the actuating unit of the system. Considering first the modification shown in Fig. a frame 344 having a base 346 is attached by nipple 3,4! to flange 343. Base 346 is provided with a boss 350 to which is attached a Sylphon 352 having a head 354. There is a passage through base 346, through which the Sylphon is filled with the same fluid as the tank. Any. change of pressure in the tank will therefore be felt by the Sylphon, causing it to expand or contract axially.

bar 353, to the outer ends of which are attached .a pair of springs 360 tending to draw the bar toward base345, and another pair of springs 362 tending to draw thebar in the opposite direction.

The fixed ends of springs 360 are attached to base 346 by adjusting screws 364 while the fixed ends of prings 362 are attached by adjusting screws 366 to lugs-.363 on frame 344. The above described arrangement of springs is provided to supplement the elasticity of Sylphon 352. r The springs are adjusted by their adjusting screws so that even when there is no pressurein the tank the Sylphon still be under substantial tension. thereby insuring a firm and definite zeroreading which might not be the case were the Sylphon allowed to become entirely deflated under zero pressure. Springs 363 and 362 being similar and opposed, theposition of the Sylphon head will be unaffected ture.

Attached to bar 353 is a U shaped yoke 310, to the crpiss bar of which are fast the free ends of a."

pair of axially aligned Sylphons 312 and 314, the 50 respectively, integral with frame 344. The adjacent heads pr the Sylphons are secured to yoke 313 by a screw 333 on head 332 of Sylphon 312 passing throughthe yoke into head 334 of Sylphon314.

Fast to head 354 and extendingbeyond it is aby changes of atmospheric temperafixed ends of which are fast tobosses 316 and :u'

I Claims. (01. 13-119) It will be apparent from the above that yoke 313' will move back and forth with head 354 of Sylphon 352, and that whensuch movements occur one of the Sylphons 312, 314 will be expanded and the other contracted axially. Syl- 5 free end of arm 408 fulcrumed at 0. Pointer 400 rotates infront-of a chart 2 and behind glass window 414 through which the indications of the pointer on the chart may be read. The indicating mechanismis all contained in a tubular housing 4l6'within which are mounted a pair of. similar Sylphons M8, 420. These Sylphons are on parallel ofiset axes, their outer ends being fast to housing brackets 422, 424, respectively, and their adjacent ends being pivotally connected by studs 426, 428 'to upper and lower ends of link 430. The center of the link is connected by pivot pin 432 to am 434 attached to the housing by plate fulcrum 435. The free end of arm 434 is connected by link 438 to upwardly projecting arm 440, integral with am 408. i

Link 438 is adjustable in length by means of right and left screw 442 for the purpose of zero adjustment of pointer 400. The link is connected to arm 440 by block 444 settable on arm 440 by screw 446 for'the purpose of adjusting the amplitude of rotation of arms 440, land consequently of pointer 400. Hand hole 448 with cover 450 is provided to give access to the adjustments.

Tubes 386 and 388 are connected to the fixed ends of Sylphons H8, 420 respectively, and both pairs of Sylphons, with the tubes; are full of liquid. 7

In operation, when a change of pressure occurs, expansion or contraction of Sylphon 352 will cause yoke 310 to axially expand one of the Sylphons 312, 314' and contract the other, thereby, v through movement of liquid through tubes 336, 333 causing one of the Sylphons4l3, 420 to contract and the other to expand axially to move link 433 bodily to leftor right and causing arms 7 434, 440 and 408 to swing about their fulcrums, thuscausing pointer 400 to move to a new position relatively to chart 2.

If a change of atmospheric temperature occurs, thereby changing the volumes of Sylphons 312, 314, 413, 420, of the'tubes connecting them, and of the liquid contained in the Sylphons and tubes,

the efiect is simply to axially expand or axially contract Sylphons H8, 420 similar amounts, thereby rotating link 430 about its fulcrum 432 without moving arm'434.v Therefore the position of pointer 400 is not changed by change of temperature.

The modification shown in Fig. 2 is very similar to that described above. The indicating unitis exactly the same except that adjustable link 438 is replacedby 'a non-adjustable link 452.com-

nected to arm 440 by a pivot pin 454 which is fixed in position on arm 448. Since there are no adjustments on link 452, there is no need for'hand hole 440, which is therefore omitted. The actuating unit includes a power Sylphon 456 in place of the corresponding Sylphon 352 of Fig. 1. At its fixed end" it is sealed to frame 458 which is attached to flange 342 by nipple 460 and connectedto the interior of the tank' by passage 462.

The movable head 454,-01 Sylphon 455 is connected by link 466 to the free end of arm 468 fulcrumed at 410. Link 466 is adjustable in length by the right and left screw 412 to providea zero adjustment for pointer 400. The pivotal connection of the link to arm 468 is at 414, through the instrumentality of a clamp block 416, settable at any desired point on arm 468 by bolt 418 passing through slot 480, thus providing an adjustment for amplitude of rotation of the pointer.

A pair of axially aligned Sylphons 482, 484 (corresponding to 312, 314 of Fig; 1 are arranged with their adjacent ends joined by rod 486 and their outer ends fixed to brackets 488, 490 mounted on frame Rod 486 is pivotally connected to arm 4 at 482. The fixed ends of Sylphons 482, 484 are connected to the fixed ends of Sylphons H8, 424 by tubes 494, 496 respectively.

In operation a change of pressure in the tank will cause Sylphon 456 to expand or contract axially, and, through link 466, arm 453 and rod 485 will cause one of the Sylphons 482, 484 to expand and the other to contract, thus, as in Fig. 1, actuating Sylphons 4| 8, 420 and their attached transmission system to move pointer 400.

It is to be understood that the invention is not limited to the specific embodiment herein illustratedand described, but may be used in other ways without departureirom its spirit as defined by the following claims.

I claim:

1. Pressure indicating apparatus comprising, in combination, a Sylphon adapted to expand or contract in response to change of pressure applied thereto, a pair of Sylphons operatively connected to said Sylphon whereby one of said pair will lengthen and the other shorten when said first Sylphon expands or contracts, a remote indicator, and means interconnecting said pair-of Sylphons to said indicator whereby said indicator will move in harmony with the changes of length. of said first Sylphon.

2. Pressure indicating apparatus comprising, in

ombination, a Sylphon adapted to expand or contract in response to change of pressure ap-- plied thereto, a pair of Sylphons operatively connected to said Sylphon whereby 'one of said pair will lengthen and the other shorten when said first Sylphon expands or contracts, a remote indicator, a second pair of Sylphons in communication with said first pair and mechanically connected to said indicator whereby said indicator is actuated in harmony with movements of said first Sylphon.

3. The invention set forth in claim 2 in which said mechanical connections include a floating ,link connected to each of said second pair of Sylphons to be actuated by each of said Sylphons in opposite directions whereby accuracy of theindications will be unaffected by change of temperature of the apparatus.

4. Pressure indicating apparatus comprising, in'combination, a Sylphon adapted to expand or contract in response to change of pressure applied thereto, a pair of Sylphons operatively connected to said Sylphon whereby one of said pair will lengthen and the other shorten when said first Sylphon expands or contracts, a remote in dicator, a second pair of Sylphons in communication with said first pair and mechanically connected through a floating link to said indicator whereby said indicator is actuated in harmony with movements of said first Sylphon, said link serving to maintain accuracy of the apparatus if changes of temperature occur.

5. Pressure indicating apparatus comprising, in combination, a' Sylphon adapted to expand or contract in response to change of pressure applied thereto, a pair of Sylphons operatively connected to said Sylphon whereby one of said pair will lengthen and the other shorten when said first Sylphon expands or contracts, a remote indicator, and manually settable means between said Sylphon and said pair of Sylphons for adjusting the zero position of said indicator.

6. Pressure indicating apparatus comprising, in combination, a Sylphon adapted to expand or contract in response to change of pressure applied thereto, a pair of Sylphons operatively connected to said Sylphon whereby one of said pair will lengthen and the other shorten when said first Sylphon expands or contracts, a remote indicator, and manually settable means between said Sylphon and said pair of Sylphons for adjusting the amplitude of motion of said indicator.

7. Pressure indicating apparatus comprising, in combination, a. Sylphon adapted to expand or contract in response to change of pressure applied thereto, a pair of Sylphons operatively connected to said Sylphon whereby one of said pair will lengthen and the other shorten when said first Sylphon expands or contracts, a remote indicator, and manually settable devices between said Sylphon and said pair of Sylphons for ad- CLARENCE A. 'DE GIERS. 

